Improvement in alarm-whistles



N, D. LAMB.

Ai whistle.

No. 33,437. Patented oct.. 8, 18.61,.'

Fries.

PATENT NOYES D. LAMB, OF NORVICI'I, CONNECTICUT.

HVIPROVEMENT IN ALARM-WHISTLES.

Specification forming part of Letters Patent No. SSAT?, dated October 8,1861.

.To @ZZ whom t may concern:

Beit known that I, NOYES D. LAMB, of the town of Norwich,` in the countyof New London and State of Connecticut, have invented a new and usefulImprovement in Air-Whistles; and I do hereby declare that the followingis a full and exact description of the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,in which- Figure l is a perspective view, and Fig. 2 a section.

The nature of my invention consists in the hereinafterdescribedcombination of devices for the purpose of producing sounds for signalsor alarms by forcing air through the whistle with the mouth.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

In the drawings, A is a tubular mouth-piece through which the air isforced into the hollow cylinder B, to which the mouth-piece is attached.

B is a hollow cylinder or receiver, and is fastened on the inside to thesounding-plate C by three bolts h b. The receiver by being constructedwithout the hollow perforated tube which is indispensable insteam-whistles is adapted to the capacity of the lungs, therebyproducing a volume of sound which other a similar effect with the sameagency cannot be produced on a steam-whistle, to which I make no claim,as my invention consists in letting the air pass into the receiverwithout the hollow perforated tube-an improvement 'which adapts thewhistle to the use pointed out. i

C is the sounding-plate supported at the center by the standard E. Thesounding-plate is fitted into the bottom of the receiveriu such a way asto form a continuous aperture D between the cicumference of the plateand the rim of the receiver.

D is the aperture extendingyentirely around the sounding-plate andpermitting the air forced into the receiver to escape into thesounding-cup F.

E is the standard secured at one end to the bottom of the sounding-cupand at the other to the sounding-'plate for the purpose of connectingthem together.

F is the sounding-cup, so placed as to admit the air from the receiverand allow the same to escape, aiding thereby in the production'of sound.The sounding-cup may be so secured to the standard as to slide on the'same for the purpose of varying the sound, increasing or diminishing theoutlet G having that effect.

Gis the outlet for the escape of air from the sounding-cup.

H is the handle.

My improved air whistle'may ,be made of tin, brass, or any othermetallic substance, and is designed for use by sailing-vessels in caseswhere darkness, snow-storms, or heavy fogs may make itl necessary tohave means Y ready at hand forgiving alarm-signals as a precautionagainst collisions. The air-whistle will therefore be found useful toboth the navy and the merchant service. It can be used by applying it tothe mouth, and compared with the fog-horns in use by coasting-vessels itrequires much less effort to produce a sound that may be heard at agreater distance, thus furnishing greater security against the danger ofcollisions.

VVh-at I claim as new and of my invention, and desire to secure byLetters Patent is- Letting the air into the receiver B without thehollow perforated tube, as described, for the purpose 'of giving marinesignals by sounds in the manner set forth.

NOYES D. LAMB. Witnesses:

HIRAM B. CROSBY, H. -I-I. STARKWEATHER.

